Bevel-protactor.



No. 7l6,|70. Patented Dec. l6, I902. C. H..BARNES.

BEVEL PROTRAGTOR.

(Application filad July 25, 1902.) (N o M 0 d e l-.)

61km I THE uumus mews mi. Pno'rqumou wnsumcn'on. n. c,

and illustrated in the accompanying draw- .for the jaw 6. throughout aportion of its length, is split at NITED r FFTCE.

CHARLES H. BARNES, OF ILION, NEW YORK, Ass1eNoR TO G ORGE E.

' BARNES, E GOUVERNEUR,.NEW YORK.

BEVEL- PROTRACTO R.

SPECIFICATION forming part of Letters Patent No. 716,170, dated December90 Application filed July 25, 1902. Serial No. 116,978. (No model.)

My invention relates to bevel-protractors;

and the object of the same is to construct a device for measuringtapers-that is, the divergence of two non-parallel sides of a piece ofwork and also the diameter of the work.

The simple and novel construction designed by me in carrying out myinvention is fully described in this specification and claimed,

ings, forming a part thereof, in which-- Figure l is a plan view of mydevice.

2 is an edge View of the same.

longitudinal section of the same.

Fig. Fig. 3 is a Fig. 4 is a plan view of the beam and one of thesectors.

Fig. 6 is a de- Fig. 7 is a per- ,A jaw 6 is mounted on the sector 3. Itbears a guide 7, which engages the curved edge of the sector 3 and hasan arm 8 formed integral therewith, which extends over the car t and hasa threaded aperture 9 therein, which registers with the aperture 5. Acenter 11 fits in the apertures and 9 and serves as a pivot The center11 is threaded 11 and bored at 11 to accommodate a threaded plug 12,which serves to expand the center 11, and thereby secure it in place.The geometrical, center of the are of. the quadrant is in alinement withthe innerface of j the jaw 6 to adapt it to measure angles of 14 toexpose the graduations on the quadrant, which can be read by meansot' anindeX 13, formed on the flange 13. A thumbnut 6" serves to clamp the jaw6.

Slidingly mounted on the beam 1 is a quadrant 15, bearing guide-flanges16 and 17, which engage the straight parallel sides of the beam 1. Thequadrant is graduated similar to the quadrant 3 and bears an ear 18,having an aperture 19 therein to accommodate a center 19 of similarconstruction to the center 11 and which fits an aperture 20, formed inan ear 20, integral with a jaw 21. The jaw 21 is similar in constructionto the jaw 6, and the geometrical center of the arc of the quadrant 15is in alinement with theinner surface of the jaw. It should be noted(see Fig. 2) that the centers 11 and 19 are so located that they are inaxial alinement when the inner faces of the jaws 6 and 21 are incontact, which makes the divergence measured the true divergence.

A set-screw 22 is mounted in an aperture in the flange 16 and isprovided with a head 22 and a foot 22", which bears on the beam andserves to clamp the quadrant 15 against all movement. A head 23, bearingguides 24, is adjustably mounted on the beam 1 and is provided with aset-screw 25, arranged to clamp the head 23 at any point desired. Anadjusting-screw 26 connects the head 23 and the quadrant 15 and isconstructed to be 0perated by a corrugated adjusting-nut 27, fittingthereon and engaging a slot 28 in the head 23. By this arrangement thequadrant can be adj nsted very accurately in measuring diameters incalibrating.

In operation, the jaws 6 and 21 are set parallel, and if their indicesdo not stand at the zeros on the quadrants 3 and 15 the index error isnoted to be applied to all measurements. The article the taper of whichis to be measured is then placed adjacent to the jaws, which areadjusted pivotally until the articles can be placed between them incontact with the inner faces of the jaws. If the pivotal adjustment isnot sufficient, the centers 11 and 19 are separated by adjusting thequadrant 15 on the beam 1 by means of the adjusting-screw 26 and nut 27.If a large adjustment is desired, the head 23 is first set approximatelyand clamped, after which the adjustment is made more accurate by meansof the adjusting-screw 26. After the adjustments have been completed thequadrants are read, and the sum of these readings will be the taperrequired.

In using my device as a caliper the jaws are first set parallel andclamped by means of the thumb-nuts 6 thereon, after which the jaw 21 isadjusted laterally by means of the adjustable head 23 and screw 26. Thereading on the scale 2 on the beam 1 will give the re quired diameter ofthe work.

I-do not wish to be limited as to details of construction, as these maybe modified in many particulars without departing from the spirit of myinvention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a device of the class described, the combination of a graduatedbeam, of a graduated sector connected to one end of said beam, a jawpivoted at the center of the arc of said sector, a graduated sector adjustably mounted on said beam, and a jaw pivoted at the center of saidlast-mentioned sector, the centers of said sectors being located in astraight line extending parallel to said beam, said jaws being arrangedto cooperate with said sectors and with each other to measure tapers ofwork placed between them, substantially as described.

2. In a device of the class described, the combination with a graduatedbeam,ofa graduated sector mounted on said beam, a jaw pivoted to saidsector, a graduated sector bear ing guides engaging said beam, and a jawpivoted to said last-mentioned sector, the centers of said sectors beinglocated in a straight line parallel to the edge of said beam,substantially as described.

3. In a device of the class described, the combination with a graduatedbeam,ofa graduated sector mounted onsaid beam, a jaw pivoted to saidsector, a graduated sector bearing guides engaging said beam, a jawpivoted to said last-mentioned sector, and means for adjusting saidguides on said beam to regulate the distance between the centers of saidsectors, the centers of said sectors being located in a straight lineparallel to said beam, substantially as described.

4. In a device of the class described, the combination with a graduatedbeam,ofagraduated sector mounted on said beam, a jaw pivoted to saidsector, a graduated sector bearing guides engaging said beam, thecenters of said sectors being located in a straight line parallel tosaid beam, a head bearing guides engaging said beam, means for clampingsaid head at any point on said beam, and an adjusting-screw connectingsaid head and said last-mentioned sector, substantially as described.

5. In a device of the class described, the combination of a pair ofpivoted jaws located to cooperate to measure tapers of articles placedbetween them, graduated arcs located to cooperate with said jaws, andmeans for adjusting the distance between the pivots of said jaws, thepivots of said jaws being located in a straight line parallel to saidbeam, substantially as described.

In testimony whereof I have here hereunto set my hand in presence of twosubscribing witnesses.

CHARLES H. BARNES.

Witnesses:

A. 0. BROWN, O. H. BROWN.

